Dot net 2.0 equivalent for this code vb.net

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It seems this code required .Net framework 3.5, i need same equivalent in .net 2.0 framework,code is below.

VB

Dim rtb As RichTextBox = Me.Controls.OfType(Of RichTextBox)()

Posted 11-May-12 0:46am

hackerspk

Updated 11-May-12 0:47am

v2

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tanweer 11-May-12 6:51am

Are you talking about Win Form or its web application?

hackerspk 11-May-12 6:52am

winform

Manfred Rudolf Bihy 11-May-12 7:42am

OfType does not produce a single element but rather a collection (IEnumerable) of them. See here[^].

Regards,

Manfred

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Manfred Rudolf Bihy · Accepted Answer · 2012-05-11T01:25:00

Solution 1

OfType does not produce a single element but rather a collection (IEnumerable) of them. See here[^].
You can reproduce the OfType extension method in .NET 2.0 along these lines:

C#

    List<RichTextBox> widgets = new List<RichTextBox>(); 
    foreach(Control control in this.Controls) 
    { 
        // If it is of type RichTextBox add it to the list 
        // In VB.NET the condition would be like: TypeOf control Is RichTextBox
        if(control is RichTextBox) 
            widgets.Add((RichTextBox)control); 
    } 
}

This example is in C#, but I hope you can understand what is going on.

Regards,

Manfred

Posted 11-May-12 1:25am

Manfred Rudolf Bihy

Updated 11-May-12 1:42am

v5

Comments

hackerspk 11-May-12 7:43am

Thanks for your answer i have a little problem more.

For Each control As Control In TabControl1.SelectedTab.Controls
If TypeOf control Is RichTextBox Then
'' control.copy() '' This line is not working while the control is richtextbox
control.Focus()
End If
Next

if i add this one more line then it works
Dim rtb As RichTextBox = control
rtb.copy()

Manfred Rudolf Bihy 11-May-12 8:16am

The secret lies in your code :). "For each control As Control" that means the variable control knows only that it's type is Control. A RichTextBox is derived from Control and has a Copy() method so when you declared the variable as RichTextBox your example worked.
Simples! :)

Sandeep Mewara 11-May-12 13:49pm

Good answer. 5!

Wendelius 11-May-12 16:23pm

Plain and simple! :) 5'd

VJ Reddy 11-May-12 23:28pm

Nice answer. 5!